Queer a. : At variance with what is usual or normal; differing in some odd way from what is ordinary; odd; singular; strange; whimsical; as, a queer story or act.

Queer a. : Mysterious; suspicious; questionable; as, a queer transaction.

Queer n. : Counterfeit money.

Example:
What's the difference between gay and Queer?

Taxonomy
queer, LGBT, gender, free encyclopedia, Gay, Queer Street, identities, LGBT rights, the 20th Century, gender identity, Gender identities, effeminate, 19th century, Queer as Folk, sociopolitical, synonym, connotations, reject.

Defination from the web:
Queer has traditionally meant odd or unusual, though modern use often pertains to LGBT (gay, lesbian, bisexual, transgender, intersex and non-normative heterosexual) people. ... Queer in this sense (depending on how broadly it is defined) is commonly used as a synonym for such terms as LGBT. ...